Hadith 2:370

Narrated Zainab bint Abi Salama:

When the news of the death of Abu Sufyan reached from Sham, Um Habiba
on the third day, asked for a yellow perfume and scented her cheeks
and forearms and said, "No doubt, I would not have been in need of
this, had I not heard the Prophet saying: "It is not legal for a woman
who believes in Allah and the Last Day to mourn for more than three
days for any dead person except her husband, for whom she should mourn
for four months and ten days."